A weak resistance minimum in AuTi

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Abstract
The author has measured the electrical resistivity of two AuTi alloys containing 0.22 and 1.06 at% Ti. The results indicate the presence of a very weak residual resistance minimum after the subtraction of the pure Au resistivity. The low temperature behaviour can be described by an equation of the form (1-T/TK)2) with TK=650+or-100K for the 0.22 at% alloy and 400+or-200K for the 1.06 at% alloy. The concentration dependence is thought to be a real effect and is considered to be the result of interactions between Ti atoms. Above 4K the total alloy resistivity follows the T3 variation as predicted on current theories of momentum nonconservation (MNC) and phonon drag. Analysis of the data on these bases indicates that the parabolic (1-T/TK)2) behaviour persists up to at least 20K. Comparison is made between the predicted coefficients of the T3 term and those found experimentally. The phonon drag calculation correctly predicts the concentration dependence of the T3 terms.

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